Games like Unexpected End
Games like Unexpected End include Portal 2, Big Walk, Superliminal, Escape Simulator, and Poppy Playtime. We matched them by the tags players give Unexpected End on Steam (Adventure, Puzzle, and First-Person): closest matches first, and among equally close ones the better-known games.

Portal 2
Shared: Puzzle · First-Person · Adventure

Big Walk
Shared: Puzzle · Adventure · First-Person

Superliminal
Shared: Puzzle · First-Person · Adventure

Escape Simulator
Shared: Puzzle · Adventure · First-Person

Poppy Playtime
Shared: Puzzle · First-Person · Adventure

The Talos Principle
Shared: Puzzle · First-Person · Adventure

Indiana Jones and the Great Circle
Shared: First-Person · Puzzle · Adventure

Antichamber
Shared: Puzzle · First-Person · Adventure

Call of the Sea
Shared: Adventure · Puzzle · First-Person

Hello Neighbor 2
Shared: Adventure · Puzzle · First-Person

A Story About My Uncle
Shared: Adventure · First-Person · Puzzle

Viewfinder
Shared: Puzzle · First-Person · Adventure

The Room
Shared: Puzzle · Adventure · First-Person

The Witness
Shared: Puzzle · First-Person · Adventure

The Turing Test
Shared: Puzzle · First-Person · Adventure

Portal
Shared: Puzzle · First-Person · Adventure

Amnesia: Rebirth
Shared: Puzzle · First-Person · Adventure

The Room 4: Old Sins
Shared: Puzzle · Adventure · First-Person

Polarity
Shared: Puzzle · First-Person · Adventure

Atomic Heart
Shared: Adventure · Puzzle · First-Person

Riven
Shared: Adventure · Puzzle · First-Person

Obduction
Shared: Adventure · Puzzle · First-Person

SchoolBoy Runaway
Shared: Adventure · Puzzle · First-Person

Killer Frequency
Shared: Adventure · Puzzle · First-Person